Bleed Pressure Regulator Valve Control Solenoid
Figure 023A
R 1EFF : 002-049, 053-099, 101-149, 151-199, 1 36-11-00Page 83 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1R Bleed Pressure Regulator Valve Control Solenoid R Figure 023B
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Bleed Pressure Regulator Valve Control Solenoid - Schematic
Figure 024
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Bleed Pressure Regulator Valve Control Solenoid - Schematic
Figure 024A
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1 1
1CES 1
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
(a)
Temperature Limitation When the temperature downstream of bleed air precooler exchanger increases and reaches 235 deg.C (455 deg.F), the INVAR rod in the sensing tube starts to open the rod valve by differential dilatation. This cause a modification of the butterfly position of the bleed pressure regulator valve which tends to close to reduce the downstream pressure . If the temperature increases up to 245 deg.C (473 deg.F) the rod valve will be full open and the bleed pressure limited to 17.5 psig.
(b)
Closure of bleed pressure regulator valve When the solenoid is energized, its valve moves away from its seal and vents the bleed pressure regulator valve which closes. When the solenoid is not energized, the solenoid valve is spring-loaded closed.
NOTE : The Bleed Pressure Regulator Valve Control Solenoid has no
____ direct effect on the HP Bleed Valve (HPV) operation. The HP Bleed Valve would also close because the Bleed Valve (PRV) closure would vent to ambient the signal pressure in the sense line between the Bleed Valve and the HP Bleed Valve.
(c) Non-return function The regulator diaphragm detects a differential pressure between downstream precooler exchanger and upstream pressure regulator valve. When the difference between upstream and downstream pressure (Delta P) is lower than or equal to 10 mb, the diaphragm moves and opens the solenoid valve, causing the closure of the bleed pressure regulator valve.
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R **ON A/C 401-499,
R (2) Function
R (Ref. Fig. 024B)
R (a) General operation.
R The bleed pressure regulator valve control solenoid continuously
R senses the temperature of the air from the bleed air precooler
R exchanger of the bleed air system. It also monitors the
R differential pressure between the upstream side of the bleed
R pressure regulator valve and the downstream side of the bleed air
R precooler exchanger.
R It controls pneumatically the air supply through the bleed air
R system by closing the bleed pressure regulator valve.
R (b) Electrical closing function.
R When the coil of the solenoid sub-assemnbly is energized, the
R core moves up and the clapper moves off its seat, under the
R spring load. This vents the coupling line and causes closure of
R the bleed pressure regulator valve.
R NOTE : The bleed pressure regulator valve control solenoid has no____
R direct effect on the HP bleed valve operation. The HP
R bleed valve also closes because the bleed pressure
R regulator valve closure vents to ambient the signal
R pressure in the sense line between the bleed pressure
R regulator valve and the HP bleed valve.
R (c) Non-return function.
R The diaphragm sub-assembly detects a differential pressure
R between the downstream section of the bleed air precooler
R exchanger and the upstream section of the bleed pressure
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